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Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 30, 2017 | Oct. 07, 2017 | Dec. 31, 2016 | Oct. 08, 2016 | Jul. 16, 2016 | Jul. 15, 2017 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Pension plan settlement loss |  | $ 1,619 | $ 3,030 | $ 173 | $ 1,832 | $ 4,641 | $ 0 | $ 4,649 | $ 6,646 |
Pension plans |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  | 755 | 830 | $ 873
Interest cost |  |  |  |  |  |  |  | 12,852 | 13,682 | 18,003
Expected return on plan assets |  |  |  |  |  |  |  | (25,669) | (26,644) | (29,642)
Pension plan settlement loss |  |  |  |  |  |  |  | 4,649 | 6,646 |
Prior service cost (credit) |  |  |  |  |  |  |  | 387 | 387 |
Actuarial (gain) loss |  |  |  |  |  |  |  | 6,355 | 7,294 | 4,978
Net periodic pension cost (income) |  |  |  |  |  |  |  | (671) | 2,195 | (5,788)
Current year actuarial (gain) loss |  |  |  |  |  |  |  | 4,119 | 8,879 | (1,916)
Current year prior service cost (credit) |  |  |  |  |  |  |  |  |  | 6,199
Settlement loss |  |  |  |  |  |  |  | (4,649) | (6,646) |
Amortization of prior service (cost) credit |  |  |  |  |  |  |  | (387) | (387) |
Amortization of actuarial gain (loss) |  |  |  |  |  |  |  | (6,355) | (7,294) | (4,978)
Total recognized in other comprehensive (loss) income |  |  |  |  |  |  |  | (7,272) | (5,448) | (695)
Total recognized in net periodic benefit cost and other comprehensive (income) loss |  |  |  |  |  |  |  | (7,943) | (3,253) | (6,483)
Postretirement Benefit Plans |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  | 256 | 401 | 398
Interest cost |  |  |  |  |  |  |  | 227 | 309 | 360
Prior service cost (credit) |  |  |  |  |  |  |  | (212) | (212) | (267)
Actuarial (gain) loss |  |  |  |  |  |  |  | (497) | (454) | (583)
Net periodic pension cost (income) |  |  |  |  |  |  |  | (226) | 44 | (92)
Current year actuarial (gain) loss | [1] |  |  |  |  |  |  | 188 | (2,354) | (159)
Amortization of prior service (cost) credit |  |  |  |  |  |  |  | 212 | 212 | 267
Amortization of actuarial gain (loss) |  |  |  |  |  |  |  | 497 | 454 | 583
Total recognized in other comprehensive (loss) income |  |  |  |  |  |  |  | 897 | (1,688) | 691
Total recognized in net periodic benefit cost and other comprehensive (income) loss |  |  |  |  |  |  |  | $ 671 | $ (1,644) | $ 599
[1] | In 2015, includes (gain) loss related to (higher) lower than expected Medicare Part D subsidy receipts.

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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